I did this a while back but now that there is a specific forum area for this sort of thing I figure I would post it.

This is an iCruze made by Monster for the purpose of interfacing with an early iPod, it was a Monster flop. The board has an atmel Attiny26L cpu on and I was able to reverse engineer the thing and make it useful.I have full source code and step by step how I figured it out at this link